AIP conference proceedings · 1972 · 39 citations · 0 references
Natural SciencesMaterials EngineeringMaterials ScienceCrystal StructureMagnetic MaterialsPhase TransformationsAntiferromagnetismFerromagnetic MaterialsFerromagnetismMagnetic Properties Of SolidsMagnetism In SolidsPhase TransitionsElectrical ResistivityFerromagnetic Phase TransitionsHeat Treatment EffectsHysteresisLattice ParametersMagnetic Phase TransitionsPhase Transition TemperatureThermal Hysteresis
The transformation between a long‐period antiferro‐magnetic and a triangular‐type weak ferromagnetic phase was investigated by magnetic, x‐ray and neutron diffraction methods on polycrystalline and single‐crystal samples of non‐stoichiometric Mn3Sn with hexagonal DO19 structure. The transition is of first‐order, being accompanied by a thermal hysteresis. A slight change in the electrical resistivity was observed during the transformation, but no change in the lattice parameters could be detected. The transition temperature depended on the conditions of annealing and varied between 150° and 300°K. In spite of the fact that the samples quenched from 800°C and those annealed in the range 650–750°C have the same crystal structure, the transformation occured only in the annealed samples. The phase transformation can be switched on and off by appropriate heat treatment.